WILLIAM T. M. FORBES 



(aside from the ^geriida?) ; but I believe it represents natural points 

 of division. The whole series of isolated genera has been put here 

 in the Yponomeutidte ; some of them are nearly Heliodinid while others 

 would go as well in the neighborhood of the Tineidse. 



Key to genera of Yponomeutoidea (except ^Egeriidae ) 2 * 



1. Venation complete or nearly so. 



2. Fore wing with five radials preserved, all running to costa (fig. 219). 



3. Wings lanceolate, hind wing immaculate .HI. Euclemensia. 



3. Wings linear; hind wing banded H 4. Idioglossa. 



3. Wings linear, hind wing immaculate H 3. Erineda. 



2. Fore wing with only four radials running to costa. 

 3. Hind wing with Mj and M 2 long-stalked (fig. 201). 



4. Palpi with a triangular tuft on second joint; maxillary palpi porrect and 



often large ' " Y 6. Plutella. 



4. Palpi nearly smooth. 



5. Head with a few erect hairs behind; maxillary palpi folded. 



Y 9. Acrolepia. 

 5. Head with a large tuft on vertex; maxillary palpi obsolete. 



Y 10. Argyresthia. 

 3. Hind wing with M, and M., separate; or a vein wholly lost. 



4. Rj arising beyond middle of cell, which is lanceolate ; without accessory 



cell * Y 12. Scythris. 



4. Cell ample, with large accessory cell; R t almost always arising before 



middle of cell. 



5. Palpi very short, drooping (fig. 222); hind wing lanceolate; M 3 long- 

 stalked or united with Cu, (fig. 218) H 2. Heliodines. 



5. Palpi upturned at least at middle of front; or wings ample, usually 



both. 



0. Hind wing with complete venation (6 veins arising from cell). 

 7. With M : . and Cu, separate or connate. 



8. Vestiture hairy; palpi obsolete (Psychidse-Solenobia). 



8. Vestiture mostly scaly, palpi well developed. 

 9. Hind tibia- bristled. 



10. Hind tibine bristled both above and below; R of hind wing 



ending at or above apex (fig. 204) Y 8. Epermenia. 



10. Hind tibiae bristled above only; R running to outer margin 



(fig. 220) H 6. Schreckensteinia. 



9. Hind tibiip with long loose hair. 



10. Palpi short, hardly exceeding front Y 5. Urodiis. 



10. Palpi upturned to vertex (XylorictidavStenoma). 



9. Hind tibiae smooth-scaled. 

 10. Palpi nearly smooth. 



11. Hind wing with M 3 and Cu, separate (fig. 198); fringe 

 less than half as wide as membrane; ocelli small. 



Y4. Attev. 

 11. Hind wing with M 3 and C^ approximate (fig. 214); ocelli 



very large. 

 12. Palpi with second and third joints equal (brown). 



G 4. Glyphipteryx. 



-'In this key the letters prefixed to the genus numbers indicate the families: Y 

 Yponomeutidse ; G = Glyphipterygidse ; H = Heliodinidae. 



